diff -r 0509fe9ad879 -r 18b32a5811f4 doc/GDB.md
--- a/doc/GDB.md	Wed Jun 12 12:38:16 2019 +0100
+++ b/doc/GDB.md	Wed Jun 12 20:20:18 2019 +0100
@@ -18,7 +18,7 @@
 
 * On *Debian Buster* (tested on as of 2018-11-26)
   ```
-  apt-get install build-essentials texinfo python3-dev flex bison libfl libexpat-dev
+  apt-get install build-essentials texinfo python3-dev flex bison libfl libexpat-dev libsource-highlight-dev
   ```
 
 * On *Ubuntu 18.04* (tested on as of 2019-03-20)